SAN JOSE — Holding onto a glimmer of hope but also seeking closure, family and friends were searching area wetlands for a missing Campbell man who San Jose police presume was murdered and his body hidden by his now-jailed co-worker.

Kyle Myrick, 28, was reported missing early Friday and was last seen leaving GP Sports at Union and Camden avenues in the Cambrian area of San Jose, where he worked as a mechanic. He had reportedly set off to perform an unspecified job task with Steve Douglas Hlebo at a nearby building and never returned, his family said.

Hlebo, 39, of Los Altos, was arrested Saturday in that city on suspicion of murder and is being held without bail at the Santa Clara County jail. Police have not specified how or why they believe Hlebo killed Myrick, a Westmont High School alum, but a source familiar with the case says a burned-out, boarded-up building next to the motorbike shop contained enough evidence of a crime scene to prompt the homicide investigation even with no sign of Myrick’s body.

John Sparry, Myrick’s stepfather, is heading the search for the victim, which has deployed over two-dozen volunteers that on Sunday combed the area around the Lexington Reservoir south of Los Gatos, and on Monday was searching an area spanning from the Palo Alto Baylands to Alviso.

The search effort is based on general suggestions from authorities, taking into consideration elements such as where Hlebo lives, where he has ties, and the most likely places where a body might be abandoned, but no direct police intelligence.

John Sparry is similarly hoping for the best but said that even if police are right about Myrick’s death, the search is necessary.

“Regardless, we’ve got to find him,” he said.

Investigators did not release any new information about the case Monday. As part of their own search for Myrick, police have seized Hlebo’s white 2013 GMC 1500 pickup truck and are seeking the public’s help if they saw the vehicle between 5 p.m. Friday and 2 a.m. Saturday.

Myrick had only been at the Cambrian shop for four days when his disappeared, having been transferred from sister shop Grand Prix Sports in Santa Clara, where he had fixed motorbikes for about a year, his mother said.

Kelly Sparry described her son, a South Bay native, as a gearhead who loved to ride his motorcycle, and highly active, as an avid snowboarder and having grown up playing baseball and football. She added he was a rock to those who know him well, dropping everything at a moment’s notice to help someone, routinely serving as a designated driver, and being a sounding board known to spend hours talking out a problem.

“We’re just hoping that he’s still alive,” his mother siad. “That’s why we’re searching as fast as we can with as many people as we can.”